This study investigated the relationship between bullying and aggression among imprisoned male adult offenders. The participants were 70 imprisoned male offenders, who were classified using the Direct and Indirect Prisoner Behaviour Checklist (DIPC) as one of four ‘bully’ groups: pure bully, pure victim, bully/victim, or not involved. Participants also completed the Buss-Perry Aggression Questionnaire (AQ), a measure of aggression and hostility. The majority of the prisoners reported behaviors indicative of bullying, with 42.9 percent classified in the bully/victim group and 12.9 percent as pure bullies. 15.7 percent of participants were classified as pure victims, while 28.6 percent did not report any involvement in bullying. Bully/victims scored higher than participants who were not involved in bullying on the Hostility scale and Total score of the AQ. A number of correlations were found between the AQ scores and number of bully behaviors perpetrated. These suggested there is an overlap between the constructs measured by the AQ and type of bullying behaviors perpetrated. The number of bullying behaviors experienced was only correlated with the Hostility scale. The results are discussed in terms of previous research and their implications for theory and practice.